/*
 * $Header: CompactionIDFactory.java, 24/08/2005 22:32:43 luisantonioa Exp $
 *
 * $Author: luisantonioa $
 * $Date: 24/08/2005 22:32:43 $
 * $Revision: 1 $
 * $Log: CompactionIDFactory.java,v $
 * Revision 1  24/08/2005 22:32:43  luisantonioa
 * Added copyright notice
 *
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.idfactory;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.logging.Logger;

import net.sf.l2j.Config;
import net.sf.l2j.database.L2DatabaseFactory;

/**
 * This class ...
 * 
 * @version $Revision: 1.2 $ $Date: 2004/06/27 08:12:59 $
 */
public class CompactionIDFactory extends IdFactory {
	private static Logger _log = Logger.getLogger(CompactionIDFactory.class
			.getName());
	private int _curOID;
	private int _freeSize;

	protected CompactionIDFactory() {
		super();
		_curOID = FIRST_OID;
		_freeSize = 0;
		java.sql.Connection con = null;
		try {
			con = L2DatabaseFactory.getInstance().getConnection();
			// con.createStatement().execute("drop table if exists
			// tmp_obj_id");
			int[] tmp_obj_ids = extractUsedObjectIDTable();
			int N = tmp_obj_ids.length;
			for (int idx = 0; idx < N; idx++)
				N = insertUntil(tmp_obj_ids, idx, N, con);
			_curOID++;
			_log.config("IdFactory: Next usable Object ID is: " + _curOID);
			_initialized = true;
		} catch (Exception e1) {
			e1.printStackTrace();
			_log.severe("ID Factory could not be initialized correctly:" + e1);
		} finally {
			try {
				con.close();
			} catch (Exception e) {
			}
		}
	}

	private int insertUntil(int[] tmp_obj_ids, int idx, int N,
			java.sql.Connection con) throws SQLException {
		int id = tmp_obj_ids[idx];
		if (id == _curOID) {
			_curOID++;
			return N;
		}
		// check these IDs not present in DB
		if (Config.BAD_ID_CHECKING)
			for (String check : ID_CHECKS) {
				PreparedStatement ps = con.prepareStatement(check);
				ps.setInt(1, _curOID);
				ps.setInt(2, id);
				ResultSet rs = ps.executeQuery();
				while (rs.next()) {
					int badId = rs.getInt(1);
					_log.severe("Bad ID " + badId + " in DB found by: " + check);
					throw new RuntimeException();
				}
				rs.close();
				ps.close();
			}
		int hole = id - _curOID;
		if (hole > N - idx)
			hole = N - idx;
		for (int i = 1; i <= hole; i++) {
			id = tmp_obj_ids[N - i];
			System.out.println("Compacting DB object ID=" + id + " into "
					+ _curOID);
			for (String update : ID_UPDATES) {
				PreparedStatement ps = con.prepareStatement(update);
				ps.setInt(1, _curOID);
				ps.setInt(2, id);
				ps.execute();
				ps.close();
			}
			_curOID++;
		}
		if (hole < N - idx)
			_curOID++;
		return N - hole;
	}

	@Override
	public synchronized int getNextId() {
		/* if (_freeSize == 0) */return _curOID++;
		/*
		 * else return _freeOIDs[--_freeSize];
		 */
	}

	@Override
	public synchronized void releaseId(int id) {
		// dont release ids until we are sure it isnt messing up
		/*
		 * if (_freeSize >= _freeOIDs.length) { int[] tmp = new int[_freeSize +
		 * STACK_SIZE_INCREMENT]; System.arraycopy(_freeOIDs, 0, tmp, 0,
		 * _freeSize); _freeOIDs = tmp; } _freeOIDs[_freeSize++] = id;
		 */
	}

	@Override
	public int size() {
		return _freeSize + LAST_OID - FIRST_OID;
	}
}
